The SD Series straight blades come standard with a ½” base angle and 1” x 6” polymer cutting edge to increase wear resistance and improve cutting power and scraping ability without adding excess weight. The tough polymer material also helps absorb plowing shock. Only the edge of the blade trips when an obstacle is encountered. It’s much less jarring than a full-trip blade, and because the plow blade stays upright, plowed snow remains in front of the blade.